Hey Andre,
Thanks for the link! I just noticed that we are already/still working on the problem: WIP: Nestable slider - breakpoints and number of slides - #7 by ValerianDigital
You can try my intermediate solution from this thread, which should still work: DUPLICATE: Nestable Slider: Custom XXL Breakpoint: Number of Slides not working - #2 by timmse
I am also closing this thread because it is a duplicate.
Best regards,
timmse